Magnetic flux - most often denoted as Φm. The SI unit of magnetic flux
(magnetic field) is the weber (Wb) in derived units: volt-seconds.

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Enter any two values - the third will be calculated.

For magnetic tapes: Magnetic fluxΦ in nWb/m = pWb/mm (tape flux)
Fluxivity is the amount of magnetic field that can be stored on a tape.

Standard reference flux Φ

nWb/m

Recorded magnetic flux Φ

nWb/m

Magnetic flux level LΦ

dB

The "magnetic flux density" B is the magnetic flux Φ divided by a surface (area) A:

B = Φ / A

The magnetic flux density B (magnetic induction)
has the unit "weber/m2 (divided by "square meter").
The magnetic flux Φ is not equal to the magnetic flux density B, because the magnetic flux is not
divided by meter squared (m2)!
We use Wb/m for the track width of the magnetic tape, that is a length measure - and no area.
For magnetic tape we do not use the "magnetic flux density", as you often can find.

The magnetic flux density B in Tesla (T) is not the magnetic flux Φ in Weber (Wb)

Maximum Output Level (MOL) performance of magnetic recording tapes at
15 ips. O = Theoretical peak flux values when aligning VU meter or PPM.
The dashed line (1955) represents the performance of the old US tape if
flux values were measured in accordance with DIN.
The Maximum Output Level (MOL) is the flux level at which third-harmonic
distortion reaches 3% of the fundamental's level measured at 1 kHz
(or 5% at 315 Hz for cassettes). There are a number of accepted magnetic
reference levels worldwide.

Weber is the practical unit of magnetic flux. It is the amount of magnetic flux which, when
linked at a uniform rate with a single-turn electric circuit during an interval of 1 second,
will induce in this circuit an electromotive force of 1 volt. Wb = V·s = m2kg/s2A.